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Stanislav Lindák, Radoslav Majdan, Ivan Janoško, Miroslav Pap and Mário Szabó

Abstract

This work is focused on the design of a hydraulic device on which simulations of pressure shocks can be performed. The hydraulic device was constructed to allow simulations of pressure shocks transferred directly in operating conditions because simulation programs for hydraulic accumulators have only theoretical values while simulation on the designed hydraulic device enables obtaining specific readings directly in operating conditions that can be set. At the first control measurement on the hydraulic device, there occurred pressure shocks generated by the hydraulic device itself, these pressure shocks being undesirable in hydraulic circuits. In order to eliminate pressure shocks in the circuit, a diaphragm accumulator was added to the hydraulic device and was used to verify the function of simulating pressure shocks and eliminating undesirable pressure shocks. During the second control measurement on the hydraulic device, a reduction of unwanted pressure shocks was shown with the help of added diaphragm accumulator, thus the function of the hydraulic device to simulate pressure shocks was confirmed, which may also refect practical application in hydraulic circuits of mobile machines.

Open access

Adam Ciećko, Marek Grzegorzewski, Stanisław Oszczak, Janusz Ćwiklak, Grzegorz Grunwald, Jan Balint and Stanislav Szabo

Abstract

The first PBN approach procedures in Slovakia became operationally effective at Bratislava and Košice airports as of 5 February 2015. The article presents the results of EGNOS Safety-of-Life Service preliminary examination in eastern Slovakia, just before official introduction of these procedures. The practical examination includes static test and test flight made with Cessna plane taking off at the airport in Bidovce — LZBD (just 16 km from international airport in Košice) and passing a route along eastern border of Slovakia. In this region the performance of EGNOS could be unsatisfactory due to lack of RIMS stations to the east from there. The experiment was performed on October 13, 2014 in cooperation of the Air Force Academy in Deblin, the Department of Aviation of Technical University in Košice and University of Warmia and Mazury in Olsztyn.